[Trac #539] kensington keyboard causes OFW to hang

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#539: kensington keyboard causes OFW to hang
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 Reporter:  dilinger             |        Owner:  wmb at firmworks.com
     Type:  defect               |       Status:  closed           
 Priority:  normal               |    Milestone:  BTest-3          
Component:  ofw - open firmware  |   Resolution:  wontfix          
 Keywords:                       |  
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Comment (by wmb at firmworks.com):

 Fixed in the first release *after* Q2B51.   The problem was that OFW was
 asking the keyboard to repeat status reports at a 4 mS rate ("4 set-
 idle"), but that particular keyboard seems to wedge when you press the
 shift key under those conditions.  Changing the set-idle parameter from 4
 to 32 cleared up the problem.

 My hypothesis is that the keyboard was experiencing internal buffer
 overflow, since the USB intr polling rate is also 4 mS.

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Ticket URL: <http://dev.laptop.org/ticket/539#comment:4>
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